Effect of silver and silver oxide additions on the mechanical and superconducting properties of YBa sub 2 Cu sub 3 O sub 7 minus. delta. superconductors

Journal Article · Sun Oct 01 04:00:00 EDT 1989 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.344152· OSTI ID:5422879

Singh, J P; Leu, H J; Poeppel, R B; Van Voorhees, E; Goudey, G T; Winsley, K; Shi, D ^[1]

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1. Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439 (US)

The effects of Ag and Ag{sub 2} O additions on the mechanical and superconducting properties of YBa{sub 2} Cu{sub 3} O{sub 7{minus}{delta}} superconductors were studied. The addition of 20-vol % Ag resulted in an increase in strength from {approx}40 to 75 MPa and a twofold increase in the critical current density ({ital J}{sub {ital c}} ) of YBa{sub 2} Cu{sub 3} O{sub 7{minus}{delta}} bar specimens. These improvements are believed to be due to the increased density. Furthermore, Ag particles may relax the residual stresses resulting from the expansion anisotropy of individual grains, and may provide increased resistance to crack propagation by pinning the propagating cracks; these effects would also increase the strength. The addition of 30-vol % Ag resulted in an increase in strength to 87 MPa, but it was associated with a decrease in {ital J}{sub {ital c}} . This decrease in {ital J}{sub {ital c}} at high Ag content is believed to be due to the presence of oxygen deficient nonsuperconducting tetragonal phase as well as continuous Ag phase. Similar effects were also observed after Ag{sub 2} O additions.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5422879
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 66:7; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
IMPURITIES
MECHANICAL PROPERTIES
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RELAXATION
SILVER
SILVER COMPOUNDS
SILVER OXIDES
STRESSES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES